In tomatoes, the gene that determines the red color of the fruit dominates over the gene for the yellow color.

In tomatoes, the gene that determines the red color of the fruit dominates over the gene for the yellow color. What kind of fruit color will be in plants from crossing heterozygous red-fruited plants with yellow-fruited ones.

Let’s designate the gene that determines the red color of tomato fruits as R, then the gene for the yellow color of tomatoes will be designated as r.

Heterozygous tomatoes have red fruits and will be written as Rr. They will produce r and R germ cells.

Yellow-fruited tomatoes will be homozygous – rr, since homozygosity is necessary for the phenotypic realization of this trait. They will produce the same type of sex cells r.

The offspring will be represented by the following options:

50% – Rr: tomatoes with red fruits;

50% – rr: tomatoes with yellow fruits.